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olpc_battery: Fix endian neutral breakage for s16 values 

When the driver was updated to be endian neutral (8e9c7716c)
the signed part of the s16 values was lost.  This is because be16_to_cpu()
returns an unsigned value.  This patch casts the values back to a s16
number prior to the the implicit cast up to an int.

Signed-off-by: Richard A. Smith <richard@laptop.org>
Signed-off-by: Daniel Drake <dsd@laptop.org>
Cc: <stable@kernel.org>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
This commit is contained in:
Richard A. Smith 2010-09-25 19:19:26 +01:00 committed by Anton Vorontsov
parent f6127b8645
commit 7cfbb29466
1 changed files with 4 additions and 4 deletions
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8
drivers/power/olpc_battery.c
View File

@ -271,14 +271,14 @@ static int olpc_bat_get_property(struct power_supply *psy,
if (ret)
return ret;
val->intval = (int)be16_to_cpu(ec_word) * 9760L / 32;
val->intval = (s16)be16_to_cpu(ec_word) * 9760L / 32;
break;
case POWER_SUPPLY_PROP_CURRENT_AVG:
ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2);
if (ret)
return ret;
val->intval = (int)be16_to_cpu(ec_word) * 15625L / 120;
val->intval = (s16)be16_to_cpu(ec_word) * 15625L / 120;
break;
case POWER_SUPPLY_PROP_CAPACITY:
ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1);
@ -299,7 +299,7 @@ static int olpc_bat_get_property(struct power_supply *psy,
if (ret)
return ret;
val->intval = (int)be16_to_cpu(ec_word) * 100 / 256;
val->intval = (s16)be16_to_cpu(ec_word) * 100 / 256;
break;
case POWER_SUPPLY_PROP_TEMP_AMBIENT:
ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2);
@ -313,7 +313,7 @@ static int olpc_bat_get_property(struct power_supply *psy,
if (ret)
return ret;
val->intval = (int)be16_to_cpu(ec_word) * 6250 / 15;
val->intval = (s16)be16_to_cpu(ec_word) * 6250 / 15;
break;
case POWER_SUPPLY_PROP_SERIAL_NUMBER:
ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8);